<template>
	<div class="wrapper">
		<!-- header部分 -->
		<header>
			<p>商家信息</p>
		</header>
		<!-- 商家logo部分 -->
		<div class="business-logo">
			<img :src="business.businessImg">
		</div>
		<!-- 商家信息部分 -->
		<div class="business-info">
			<h1>{{business.businessName}}</h1>
			<p>&#165;{{business.starPrice}}起送 &#165;{{business.deliveryPrice}}配送</p>
			<p>{{business.businessExplain}}</p>
		</div>
		<!-- 食品列表部分 -->
		<ul class="food">
			<li v-for="(item,index) in foodArr">
				<div class="food-left">
					<img :src="item.foodImg">
					<div class="food-left-info">
						<h3>{{item.foodName}}</h3>
						<p>{{item.foodExplain}}</p>
						<p>&#165;{{item.foodPrice}}</p>
					</div>
				</div>
				<div class="food-right">
					<div>
						<i class="fa fa-minus-circle" @click="minus(index)" v-show="item.quantity!=0"></i>
					</div>
					<p><span v-show="item.quantity!=0">{{item.quantity}}</span></p>
					<div>
						<i class="fa fa-plus-circle" @click="add(index)"></i>
					</div>
				</div>
			</li>
		</ul>
		<div class="kongbai">

		</div>
		<!-- 购物车部分 -->
		<div class="cart">
			<div class="cart-left">
				<div class="cart-left-icon" :style="totalQuantity==0?'background-color:#505051;':'background-color:#3190E8;'">
					<i class="fa fa-shopping-cart"></i>
					<div class="cart-left-icon-quantity" v-show="totalQuantity!=0">{{totalQuantity}}</div>
				</div>

				<div class="cart-left-info">
					<p>&#165;{{totalPrice}}</p>
					<p>另需配送费{{business.deliveryPrice}}元</p>
				</div>
			</div>
			<div class="cart-right">
				<!-- 不够起送费 -->
				<div class="cart-right-item" v-show="totalSettle<business.starPrice" style="background-color: #535356;cursor: default;">
				&#165;{{business.starPrice}}起送
				</div>
				<!-- 达到起送费 -->
				<div class="cart-right-item" @click="toOrder" v-show="totalSettle>=business.starPrice">
					去结算
				</div>
			</div>
		</div>
	</div>
</template>

<script>
	export default {
		name: 'BusinessInfo',
		data() {
			return {
				businessId: this.$route.query.businessId,
				business: {},
				foodArr: [],
				user: {}
			}
		},
		created() {
			this.user = this.$getSessionStorage('user');
			let url = `http://localhost:10300/BusinessController/getBusinessById/${this.businessId}`;
			this.$axios.get(url).then(response => {
				this.business = response.data.result;
				this.foodArr = this.business.foodList;
				for (let i = 0; i < this.foodArr.length; i++) {
					this.foodArr[i].quantity = 0;
				}
				//如果已登录，那么需要去查询购物车中是否已经选购了某个食品
				if (this.user != null) {
					this.listCart();
				}
			}).catch(error => {
				console.error(error);
			});
		},
		methods: {
			listCart() {
				let url = `http://localhost:10400/CartController/listCart/${this.user.userId}/${this.businessId}`;
				this.$axios.get(url).then(response => {
					let cartArr = response.data.result;
					//遍历所有食品列表
					for (let foodItem of this.foodArr) {
						foodItem.quantity = 0;
						for (let cartItem of cartArr) {
							if (cartItem.foodId == foodItem.foodId) {
								foodItem.quantity = cartItem.quantity;
							}
						}
					}
					this.foodArr.sort(); //确保vue能监听到变化！
				}).catch(error => {
					console.error(error);
				});
			},
			add(index) {
				//登陆验证
				if (this.user == null) {
					this.$router.push({
						path: '/login'
					});
					return;
				}
				if (this.foodArr[index].quantity == 0) {
					//insert
					this.savaCart(index);
				} else {
					//update
					this.updateCart(index, 1);
				}
			},
			minus(index) {
				if (this.user == null) {
					this.$router.push({
						path: '/login'
					});
					return;
				}
				if (this.foodArr[index].quantity > 1) {
					//update
					this.updateCart(index, -1);
				} else {
					//delete
					this.removeCart(index);
				}
			},

			savaCart(index) {
				let url = `http://localhost:10400/CartController/saveCart/${this.user.userId}/${this.businessId}/${this.foodArr[index].foodId}`;
				this.$axios.post(url).then(response => {
					if (response.data.result == 1) {
						//此食品数量要更新为1：
						this.foodArr[index].quantity = 1;
						this.foodArr.sort();
					} else {
						alert('向购物车中添加食品失败！');
					}
				}).catch(error => {
					console.error(error);
				});
			},
			
			updateCart(index, num) {
				let url = `http://localhost:10400/CartController/updateCart/${this.user.userId}/${this.businessId}/${this.foodArr[index].foodId}/${this.foodArr[index].quantity + num}`;
				this.$axios.put(url).then(response => {
					if (response.data.result == 1) {
						//此食品数量要更新为1或-1；
						this.foodArr[index].quantity += num;
						this.foodArr.sort();
					} else {
						alert('向购物车中更新食品失败！');
					}
				}).catch(error => {
					console.error(error);
				});
			},

			removeCart(index) {
				let url = `http://localhost:10400/CartController/removeCart/${this.user.userId}/${this.businessId}/${this.foodArr[index].foodId}`;
				this.$axios.delete(url).then(response => {
					if (response.data.result == 1) {
						//此食品数量要更新为0；视图的减号和数量要消失
						this.foodArr[index].quantity = 0;
						this.foodArr.sort();
					} else {
						alert('从购物车中删除食品失败！');
					}
				}).catch(error => {
					console.error(error);
				});
			},
			
			toOrder() {
					this.$router.push({
						path: '/orders',
						query: {
							businessId: this.business.businessId
						}
					});
				}
			},
			computed: {
				//食品总价格
				totalPrice() {
					let total = 0;
					for (let item of this.foodArr) {
						total += item.foodPrice * item.quantity;
					}
					return total;
				},
				
			//食品总数量
			totalQuantity() {
				let quantity = 0;
				for (let item of this.foodArr) {
					quantity += item.quantity;
				}
				return quantity;
			},
			//结算总价格
			totalSettle() {
				return this.totalPrice + this.business.deliveryPrice;
			}
		}
	
	}
</script>

<style scoped>
	/****************** 总容器 ******************/
	.wrapper {
		width: 100%;
		height: 100%;
	}

	/****************** header部分 ******************/
	.wrapper header {
		width: 100%;
		height: 12vw;
		background-color: #0097FF;
		color: #fff;
		font-size: 4.8vw;
		position: fixed;
		left: 0;
		top: 0;
		z-index: 1000;
		display: flex;
		justify-content: center;
		align-items: center;
	}

	/****************** 商家logo部分 ******************/
	.wrapper .business-logo {
		width: 100%;
		height: 35vw;
		/*使用上外边距避开header部分*/
		margin-top: 12vw;
		display: flex;
		justify-content: center;
		align-items: center;
	}

	.wrapper .business-logo img {
		width: 40vw;
		height: 30vw;
		border-radius: 5px;
	}

	/****************** 商家信息部分 ******************/
	.wrapper .business-info {
		width: 100%;
		height: 20vw;
		display: flex;
		flex-direction: column;
		justify-content: center;
		align-items: center;
	}

	.wrapper .business-info h1 {
		font-size: 5vw;
	}

	.wrapper .business-info p {
		font-size: 3vw;
		color: #666;
		margin-top: 1vw;
	}

	/****************** 食品列表部分 ******************/
	.wrapper .food {
		width: 100%;
		/*使用下外边距避开footer部分*/
	}

	.wrapper .food li {
		width: 100%;
		box-sizing: border-box;
		padding: 2.5vw;
		user-select: none;
		display: flex;
		justify-content: space-between;
		align-items: center;
	}

	.wrapper .food li .food-left {
		display: flex;
		align-items: center;
	}

	.wrapper .food li .food-left img {
		width: 20vw;
		height: 20vw;
	}

	.wrapper .food li .food-left .food-left-info {
		margin-left: 3vw;
	}

	.wrapper .food li .food-left .food-left-info h3 {
		font-size: 3.8vw;
		color: #555;
	}

	.wrapper .food li .food-left .food-left-info p {
		font-size: 3vw;
		color: #888;
		margin-top: 2vw;
	}

	.wrapper .food li .food-right {
		width: 16vw;
		display: flex;
		justify-content: space-between;
		align-items: center;
	}

	.wrapper .food li .food-right .fa-minus-circle {
		font-size: 5.5vw;
		color: #999;
		cursor: pointer;
	}

	.wrapper .food li .food-right p {
		font-size: 3.6vw;
		color: #333;
	}

	.wrapper .food li .food-right .fa-plus-circle {
		font-size: 5.5vw;
		color: #0097EF;
		cursor: pointer;
	}

	.wrapper .kongbai {
		height: 14vw;
	}

	/****************** 购物车部分 ******************/
	.wrapper .cart {
		width: 100%;
		height: 14vw;
		position: fixed;
		left: 0;
		bottom: 0;
		display: flex;
	}

	.wrapper .cart .cart-left {
		flex: 2;
		background-color: #505051;
		display: flex;
	}

	.wrapper .cart .cart-left .cart-left-icon {
		width: 16vw;
		height: 16vw;
		box-sizing: border-box;
		border: solid 1.6vw #444;
		border-radius: 8vw;
		background-color: #3190E8;
		font-size: 7vw;
		color: #fff;
		display: flex;
		justify-content: center;
		align-items: center;
		margin-top: -4vw;
		margin-left: 3vw;
		position: relative;
	}

	.wrapper .cart .cart-left .cart-left-icon-quantity {
		width: 5vw;
		height: 5vw;
		border-radius: 2.5vw;
		background-color: red;
		color: #fff;
		font-size: 3.6vw;
		display: flex;
		justify-content: center;
		align-items: center;
		position: absolute;
		right: -1.5vw;
		top: -1.5vw;
	}

	.wrapper .cart .cart-left .cart-left-info p:first-child {
		font-size: 4.5vw;
		color: #fff;
		margin-top: 1vw;
	}

	.wrapper .cart .cart-left .cart-left-info p:last-child {
		font-size: 2.8vw;
		color: #AAA;
	}

	.wrapper .cart .cart-right {
		flex: 1;
	}

	/*达到起送费时的样式*/
	.wrapper .cart .cart-right .cart-right-item {
		width: 100%;
		height: 100%;
		background-color: #38CA73;
		color: #fff;
		font-size: 4.5vw;
		font-weight: 700;
		user-select: none;
		cursor: pointer;
		display: flex;
		justify-content: center;
		align-items: center;
	}

	/*不够起送费时的样式（只有背景色和鼠标样式的区别）*/
	/*
		.wrapper .cart .cart-right .cart-right-item{
		width: 100%;
		height: 100%;
		background-color: #535356;
		color: #fff;
		font-size: 4.5vw;
		font-weight: 700;
		user-select: none;
		display: flex;
		justify-content: center;
		align-items: center;
		}
		*/
</style>
